The main reasons why your tag has not been validated are as follows:
The content of the design steps on the template lines.
The label is designed in colour. The label is printed in black and white, so we only allow designs in greyscale, black and white.
It is not legible. Check that the font you have used is not complex, is converted to strokes and that the font size is not too small.
The file is corrupt and cannot be opened. Check the export format and that it can be opened correctly.
Check the errors mentioned above and contact Customer Service if you have any questions.